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Патент USA US3065775

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Nov. 27, 1962
"
J. M. c. YOUNG
3,065,765
DEVICE, FOR INTERMITTENTLY SUPPLYING LUBRICANTS
Filed Dec. 4, 1961
/
Shoe
1
3,065,765
DEVICE FOR INTERMITTENTLY SUPPLYHNG
LUBRKCANTS
John Michael Crispin Young, Solihull, England, assignor
to Joseph Lucas (Industries) Limited, Birmingham,
England
3,0?5,765
Patented Nov. 27, 1962
2
pistons 6, 12 presented to the chamber 2 are so chosen
that the ?rst effect of the lubricant will be to move the
piston 6 against its spring 7 until such movement is
arrested by the shoulder 9. In this position the piston
6 covers the passage 15. The pressure in the chamber
2 now rises to a value suf?cient to move the piston 12
Filed Dec. 4, 1961, Ser. No. 156,679
Claims priority, application Great Britain Dec. 8, 196%)
1 Claim. (Ci. 137-62414)
against the spring 13.
The ?rst effect of this will be
cant under pressure to a pump or other machine.
drops and the piston 6 is moved by its spring 7 to main
tain the pressure. However, when the passage 15 be
to uncover the passage 15 and allow lubricant to ?ow
into the latter. Further movement of the piston 12 un
10 covers the passages 16 and allows lubricant to be sup
The object of this invention is to provide in a con
plied to the machine or machines, As soon as the pas
venient form means for intermittently supplying lubri
sages 16 are uncovered the pressure in the chamber 2
Means in accordance with the invention comprises a
chamber, ?rst and second bores extending from said
tween the bores 5, It} is uncovered by piston 6, the
chamber, ?rst and second pistons within said bores re
pressure acting on the piston 12 drops and it is moved
spectively and spring-loaded towards the chamber, means
onto its seating 11, and the cycle is repeated.
for supplying lubricant to the chamber, a passage ex
A system in accordance with the invention may ‘be
tending from the second bore and arranged to be nor
used whenever it is required to supply lubricant inter
mally covered by the second piston, but to be uncovered 20 mittently to a machine. One particular application of
when the second piston is moved against its spring, said
the example described is in the lubrication of the pumps
passage communicating with the ?rst bore on the side
employed in a reheat system of a gas turbine engine.
of the ?rst piston remote from the chamber and being
In this case the reheat system is not continuously in
arranged to be covered by the ?rst piston when it is
operation and in order to avoid waste of lubricant the
moved against the action of its spring, and one or more 25 passage 15 is provided with a branch pipe 17 whfch
further passages extending from the second bore and
communicates with the source 3 through a normally
adapted to communicate with said machine, the arrange
open valve 18 which is closed by a solenoid 19 when
ment being such that, in use, the ?rst piston is depressed
the reheat system is operative.
before the second piston.
Having thus described my invention what I claim as
The accompanying drawing is a sectional view illus 30 new and desire to secure by Letters Patent is:
trating one example of the invention.
'Means for intermittently supplying lubricants under
Referring to the drawing, there is provided a body 1
pressure to a machine and comprising a chamber, ?rst
within which is de?ned a chamber 2 to which lubricant
and second bores extending from said chamber, ?rst
is supplied from a source 3 by a constant ‘delivery pump
and second pistons within said bores respectively, ?rst
4. Extending from the chamber 2 is a ?rst bore 5 with 35 and second springs loading said pistons towards the cham
in which is contained a piston 6. The piston 6 is loaded
ber respectively, means for supplying lubricant to the
by a spring 7 towards the chamber 2, whilst the end of
chamber, a ?rst passage extending from the second bore
the bore 5 remote from the chamber is connected to
and arranged to be normally covered by the second
the upstream side of the pump 4 through a pipe 8. Fur
piston, but to be uncovered when the second piston is
ther, the bore is stopped intermediate its ends to de?ne 40 moved against the action of the second spring, said ?rst
a shoulder 9 serving to limit movement of the piston 6
passage communicating with the ?rst bore on the side
against the action of its spring 7.
of the ?rst piston remote from the chamber and being
Also extending from the chamber 2 is a second bore
arranged to be covered by the ?rst piston when it is
10 which is initially stepped to de?ne a truncated coni
moved against the action of the ?rst spring, and a fur
cal shoulder 11 between the chamber 2 and bore 10.
ther passage extending from the second bore for com
Within the bore 10 is a piston 12 which is loaded by a
munication with said machine, said further passage being
spring 13 towards the shoulder 11 and on its face pre
arranged to be normally covered by the second piston,
sented to the chamber 2 is provided with a half-ball
valve 14 adapted to seat against the shoulder 11.
Extending from the bore 10 is a passage 15 which
communicates with the bore on the side of the piston 6
remote from the chamber 2. The passage 15 is nor
mally closed by the valve 14. Also extending from the
but to be uncovered when the second piston is moved
against the action of the second spring after the ?rst
passage is uncovered, the ratio of the effective areas of
the ?rst and second pistons acted upon by pressure in
the chamber being greater than the ratio of the forces
exerted on the pistons by the ?rst and second springs
bore 10 are passages 16 which communicate with the
machine or machines to which lubricant is to be sup~ 55 respectively, so that the ?rst piston is depressed before
the second piston as the pressure in the chamber in—
plied.
In operation, when the pump 4 is started, lubricant
is supplied to the chamber 2. The relative areas of the
creases.
"
No references cited.
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